'use strict';

function get_union(collection_a, collection_b) {
  let arr=[];
  for(let i of collection_a){
    arr.push(i);
  }
  for(let j of collection_b){
    if(!collection_a.includes(j)){
      arr.push(j);
    }
  }
  return arr;
}

module.exports = get_union;

